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23 April 2024

» arxiv » 1411.4963

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Measurement of the forward charged particle pseudorapidity density in pp collisions at sqrt(s) = 8 TeV using a displaced interaction point
TOTEM Collaboration ; G. Antchev ; P. Aspell ; I. Atanassov ; V. Avati ; J. Baechler ; V. Berardi ; M. Berretti ; E. Bossini ; U. Bottigli ; M. Bozzo ; E. Brücken ; A. Buzzo ; F. S. Cafagna ; M. G. Catanesi ; C. Covault ; M. Csanád ; T. Csörgő ; M. Deile ; M. Doubek ; K. Eggert ; V. Eremin ; F. Ferro ; A. Fiergolski ; F. Garcia ; V. Georgiev ; S. Giani ; L. Grzanka ; J. Hammerbauer ; J. Heino ; T. Hilden ; A. Karev ; J. Kašpar ; J. Kopal ; V. Kundrát ; S. Lami ; G. Latino ; R. Lauhakangas ; T. Leszko ; E. Lippmaa ; J. Lippmaa ; M. V. Lokajíček ; L. Losurdo ; M. Lo Vetere ; F. Lucas Rodríguez ; M. Macrí ; T. Mäki ; A. Mercadante ; N. Minafra ; S. Minutoli ; F. Nemes ; H. Niewiadomski ; E. Oliveri ; F. Oljemark ; R. Orava ; M. Oriunno ; K. Österberg ; P. Palazzi ; Z. Peroutka ; J. Procházka ; M. Quinto ; E. Radermacher ; E. Radicioni ; F. Ravotti ; E. Robutti ; L. Ropelewski ; G. Ruggiero ; H. Saarikko ; A. Scribano ; J. Smajek ; W. Snoeys ; J. Sziklai ; C. Taylor ; N. Turini ; V. Vacek ; J. Welti ; J. Whitmore ; P. Wyszkowski ; K. Zielinski ;
Date:	18 Nov 2014
Abstract:	The pseudorapidity density of charged particles dN(ch)/deta is measured by the TOTEM experiment in pp collisions at sqrt(s) = 8 TeV within the range 3.9 < eta < 4.7 and -6.95 < eta < -6.9. Data were collected in a low intensity LHC run with collisions occurring at a distance of 11.25 m from the nominal interaction point. The data sample is expected to include 96-97\% of the inelastic proton-proton interactions. The measurement reported here considers charged particles with p_T > 0 MeV/c, produced in inelastic interactions with at least one charged particle in -7 < eta < -6 or 3.7 < eta <4.8 . The dN(ch)/deta has been found to decrease with \|eta\|, from 5.11 +- 0.73 at eta = 3.95 to 1.81 +- 0.56 at eta= - 6.925. Several MC generators are compared to the data and are found to be within the systematic uncertainty of the measurement.
Source:	arXiv, 1411.4963
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